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std::chrono...indexed::ok(3)  C++ Standard Libary std::chrono...indexed::ok(3)

NAME
       std::chrono::weekday_indexed::ok	- std::chrono::weekday_indexed::ok

Synopsis
	  constexpr bool ok() const noexcept;  (since C++20)

	  Checks  if the weekday object	and the	index stored in	*this are both
       valid.

Return value
	  true if weekday().ok() == true and index() is	in the range  [1,  5].
       Otherwise false.

Example
       // Run this code

	#include <iostream>
	#include <chrono>

	int main()
	{
	    std::cout << std::boolalpha;

	    std::chrono::weekday_indexed wdi {std::chrono::Tuesday[2]};
	    std::cout << (wdi.ok()) << ' ';
	    wdi	= {std::chrono::weekday(42)[2]};
	    std::cout << (wdi.ok()) << ' ';
	    wdi	= {std::chrono::Tuesday[-4]};
	    std::cout << (wdi.ok()) << '\n';
	}

Output:
	true false false

http://cppreference.com		  2022.07.31	  std::chrono...indexed::ok(3)

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